THE HEAT IS ON!!!!!!!!!!

What is Heat?

• Heat is the flow of energy from one place to another.

• Heat always flows from warmer objects to cooler objects.

Sun Land

The Sun: Our Main Source of Heat

• The sun is our main source of heat here on Earth.•Heat from the sun travels

through the air until it reaches our skin. This warms us up!!!

A Little Fuel on the Fire

• A fuel is anything that can be burned to produce heat like wood, oil, coal, or gas.

• Some fuels are fossil fuels.• Fossil Fuels- formed millions of years ago

from the remains of ancient plants and animals– coal, natural gas, and oil

• Fossil fuels are nonrenewable resources from the Earth. When they’re gone, they’re gone.

More Sources of Heat

• Electricity produces heat. It also powers machines that produce heat.

• Friction- two materials rubbing together (like your hands on a cold day!!!!)

What Materials Transfer Heat?

• Materials that transfer heat well are called conductors.

• Metals like copper, iron, silver, and aluminum are examples of conductors.

What Materials Do Not Transfer Heat Well?

• Materials that do not transfer heat well are called insulators.

• Examples: wood, plastic, cloth, rubber

Heat in the Kitchen

Where is the conductor and insulator located on this frying pan?

Three Ways Heat is Transferred

• Conduction—the transfer of heat energy between two objects that are touching.

Three Ways Heat is Transferred

• Convection—the transfer of heat energy through a fluid like a liquid or gas.

Three Ways Heat is Transferred

• Radiation—the transfer of heat energy through space or air.

How Does Heat Affect Size?

• Most matter expands, or gets larger when heated.

• When matter cools, it contracts, or shrinks.

* Remember what the physicist showed you on Career Day with the brass ball and brass ring?

People Keep Warm By…• Wearing layers of clothing to form insulation

• Rubbing hands together

• Building a fire

People Keep Warm By…

• Turning on a heater

• Sitting near the sunlight

• Using an electric blanket